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Title: FU19 Nephrops Grounds 2014 UWTV Survey and catch options for 2015
Authors: Lordan, C.
Doyle, J.
Fitzgerald, R.
O'Connor, S.
Blaszkowski, M.
Simpson, S.
Keywords: Nephrops norvegicus
stock assessment
underwater television (UWTV)
Issue Date: Oct-2014
Publisher: Marine Institute
Citation: Lordan, C., Doyle, J., Fitzgerald, R., O’Connor, S., Blaszkowski, M., and Simpson, S. 2014. FU19 Nephrops grounds 2014 UWTV Survey report and catch options for 2015. Marine Institute UWTV Survey report.
Series/Report no.: Version 2 Final;
Abstract: This report provides the main results and findings of the fifth underwater television survey of the various Nephrops patches in Functional Unit 19. The survey was multi-disciplinary in nature collecting UWTV, CTD, multi-beam and other ecosystem data. In 2014 a total 40 UWTV stations were successfully completed. The mean density estimates varied considerably across the different patches. The 2014 raised abundance estimate of 636 million burrows was a 31% increase from the 2013 estimate. Taking into account the uncertainty (CV of 15%) this is not significantly different from abundance estimates since 2011. Using the 2014 abundance and recent mean weight and discard parameters would imply total catches of 1119 t fishing at Fmsy in 2015. Based on recent discard patterns which are high in this area; 715 t would be landings and 404 t would be discards. Two species of sea pen were observed; Virgularia mirabilis and Pennatula phosphorea, both species have been observed on previous surveys of FU19.
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